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Detector Utility/Service Cavern
2017/9/28 Yasuhiro Sugimoto
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Introduction
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Alternative IR design by Tohoku team
Alternative IR design was presented at SLAC LC workshop
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Alternative IR design by Tohoku team
In reality, not rectangular area
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Alternative IR design by Tohoku team
In reality, not rectangular area
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Alternative IR design by Tohoku team
TDR modified (two vertical shafts) Proposed design of Utility cavern Utility hall Floor Area 50m x 20m = 1000 m2 volume 50m x 20m x 10m =10,000m3 Tunnel volume 53m2 x 200m =10,600 m3 TDR modified Utility hall Floor Area 25m x 25m x 5floors = 3125 m2 hall volume 25m x 25m x 43m =26,875m3 Bypass Tunnel volume 13m2 x 200m =2,600 m3 Required Utilities footprint Device Footprint = 1305 m2 Elevator footprint x 5 floors = 780 m2 Carry-in space = 296 m2 connection tunnel between Utility and DR Bypass tunnels between Utility and ML, DH, BDS, dumps Utility-IP distance 66.5m (vibration issue) Utility-IP distance 109m (vibration issue) Q: How simple is Energy flow? what is the effect of mechanical vibration to IP?
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Alternative IR design by Tohoku team
5th Floor 3rd Floor 4th Floor 1st Floor 2nd Floor
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Alternative IR design by Tohoku team
In this design, DH is extended, and the extended part is used for utilities for accelerator Original utility cavern is removed No consideration for detector services/utilities Many other concerns Level of the 5th floor is higher than crane rail Vibration Noise Effect of stray B field when a detector magnet is ON in the garage position Radiation safety Fire safety Legitimacy with “Building Standards Law” Confusion during construction/operation Utilities for Acc., ILD, and SiD at the same place???
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Detector Services/Utilities
I cannot accept the alternative design because there is no consideration on detector services/utilities, and not enough space for them Then, how much space do you need? ……. I don’t know exact number We have to clarify requirements for underground services/utilities for detectors
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Service caverns for lhc Detectors
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ATLAS USA15 Another small service cavern US15
Size: 20mx62m = 1240 m2 (height=13.5m) 2~3 floors Separated from UX15 by 2m thick wall Another small service cavern US15 ~100 electronics racks are placed in the detector hall
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CMS USC55 Size: 18mx85m = 1530 m2 Two floors
~1/3 is used for electronics racks Bypass tunnel for accelerator
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CMS
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CMS
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Service/Utility requirements for ilc detectors
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Requirement survey Requirements for the ILC Detector Hall have been summarized as an excel file by MDI community However, space requirement is not listed there
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Services/utilities to be considered
Detector services Electronics racks (Back-end electronics, low voltage PS, etc.) Sub-detector cooling plants Laser system for calibration Chamber gas (including control system) Cryogenics for solenoid/QD0 Utilities Electricity Cooling water (normal/chilled water) HVAC (Heating, ventilation, and air conditioning) He gas Compressed air for air pad/other controls Others Workshop Sanitary
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Electronics racks So-called 19-inch racks
Used for back-end electronics, low voltage power supply, controllers for services, computer farm, etc. CMS uses ~250 racks with 1.6MW power consumption ILD One rack would occupy 1.2x3 m2 footprint including space for cables, cooling, and operation ~60 racks can be put on the 2~5F of utility gallery If we assume 120 racks (1/2 of CMS) is necessary, 60 racks have to be placed in service cavern Each rack would be cooled by a fan-coil unit using chilled water as coolant How many racks do we need in total? Electronics racks
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Utility gallery Utility gallery for each detector in DH
1F: to be used as loading area 2F: 142 m2 3F-5F: 570 m2 6F: 386 m2 (for cryogenics) Space for passage for people/apparatus should be secured
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Sub-detector cooling plants
Sub-detector cooling plants require quite large space Some of them (ECAL cooling system) have to be put on 1F or below Cooling water (normal or chilled) is necessary for the cooling plant (secondary loop) Belle-II VTX cooling plant (2-phase CO2)
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Sub-detector cooling plants
ATLAS IBL (Si detector) cooling system (2-phase CO2) in the service cavern
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Laser system Laser system will be used for tracker alignment and calorimeter calibration Laser light source requires isolated space
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Chamber gas Chamber gas is necessary for TPC and SDHCAL
Gas storage on surface like CMS? CMS RPC gas system
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Cryogenics He compressor on surface
Pressurized He through main shaft or utility shaft? Cold box is attached to detector (platform) DC power supply on 6th floor of Utility Gallery Dump resister on 6th floor of Utility Gallery? Cold box for QF1 on 6th floor of Utility Gallery(?)
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Electricity 275kV66kV trans and 66kV6kV trans. on surface
6kV400/200/100V trans. in Utility/Service cavern (restricted area)
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Cooling water Normal water Chilled water
Magnet (Solenoid, QD0, QF1) power supply Dump resister (after quench) Precision chillers for sub-detector cooling systems ~800kW~1m3/min if DT=10℃ Chilled water Electronics racks through fan-coil units Sub-detector cooling system ~700kW~2m3/min if DT=5℃ High pressure due to Dh~100 m should be isolated from underground apparatus using heat exchanger (2-loop system)
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Chilled water ~20m ~100m
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HVAC Air handling units on surface (next to assembly hall)
Air ducts through main shaft
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HVAC - CMS
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Garage for air handling units
HVAC – Assembly Hall Garage for air handling units
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Compressed air ~5MPa compressed air is necessary for air-pads
~1MPa compressed air might be necessary for control and tools Compressor on surface Buffer tank in service cavern?
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Space requirement for service/utility cavern
Preliminary guess (ILD only) Width (m) Depth (m) Number Area (m2) Heat exchanger 1 3 6 18 Water pump Transformer 4 24 Air buffer tank 2 Sub-det cooling system 5 10 150 Laser system 9 Electronics racks 1.2 60 216 Duct/cable tray 25 WC 30 Workshop Total 538
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Space requirement for service/utility cavern
More than 1000m2 space might be necessary for utility/service caverns for ILD and SiD Alternative design by Tohoku team does not have enough space for detector utilities and services It is much more preferable to build utility/service caverns for accelerator, ILD, and SiD separately
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Counter proposal
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Counter proposal Separated utility caverns
Utility shaft and acc. utility cavern on the other side of damping ring tunnel Small connection tunnels Between utility cavern and detector hall Between beam tunnel and DH alcoves
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Small connection tunnels
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Pros and cons Merits Demerits
Larger space for detector services/utilities Vibration source is far from IP Each utility/service caverns and elevator hall can be separated by firewalls Less confusion in designing, construction, and operation Demerits Elevator is far from DH (You have to walk longer)
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Energy Flow Tohoku design For accelerator only
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Energy Flow Counter proposal For accelerator RTML RTML For detector
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Summary Alternative design of Utility Hall was proposed by Tohoku team, but detector service/utility was not considered in that design Motivated by that design, study on the requirement for utilities for detectors has been started A possible counter proposal of the utility caverns has been presented Anyway, each sub-detector group should think about necessary services and utilities Number of electronics racks Space and cooling water for sub-detector cooling system Total AC power (voltage and current) Chamber gas system LASER alignment/calibration system etc.
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Backup slides
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Utility gallery
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Utility gallery
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Utility gallery
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Utility gallery
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